Attachment for screw drivers



June 17, 1930.

c. 'w. BRONK 1,764,504

ATTACHMENT FOR SCREW DRIVERS Filed Aug. 28, 1928 INVENTOR. Omens M Bea/v.

A T ORNEY or flange member 12 whereby such springis. retained in position; By, virtue ofrthis spring '18 and the crimp -10..in thejaws, it will be.

screw 4 to hold it securely in position as shown: in Figures 1 and 2. The aws 5 are cut away adjacent these clamping portions 6 as atj7to provide resiliency in such clamping portions and also to vprovide openings through which,

the screw 4 may be inserted from the side of the clamp if desired. It will be noted that:

ve of th cut way Porti n 7 s.

enlargedras at 8 to permit the insertion of the head of the screw or bolt therethrou gh. Ob-

of the jaws, the same are crimpedinwardly as at 10, causingthe extreme end thereof tofiare outwardly as at 11. The ends of theseflared portions'll are provided with a laterally extending burr or flange spun or otherwise suit-v ably provided thereon as shown at 12. Alight] coilspring 13 is adapted to encircle theijaws at the heel portion thereof, and preferably is screwed or otherwise attacheduponthe burr clear; that, the function of the spring is, normallyto force the upper end Got the jaws apart. It will be noted here thatthe. flared; portions 11 of the clamp are provided with:

tongue andnotch connections as 211- 14; to 'prevent relative longitudinal movement between the jaw members 5. r I Encircling. theouter side of the; j aw, members5 is a resilient clamping member 15in the.

form of a SllQIlhCOilzOfeflflll, spring: material,

adapted to slide downwardly upon the slop ing portions 9 of the jaws-whereby topermit, the coil spring 13- tospread the ends 6 of the jaws apart to'receive. the'screw 4;. lyhenthe screwdriver has been inserted Within the slot;

in the head of the screw 4:, however, thedclamping member 15 may he slid upwardly and.

around the enlarg'e d portion ofL-the jaws 5 whereby theclampingportions 6 ofthe jawswill be securely drawn againstthe screweto rigidly hold it in position with respect/to the.

screw driver.

Attention is called to another. featureand function ofthe flared ends lland-the. coil spring. 13, namely that of preventing. the

clamping member. 15 slipping over theend of the jaws 5 and permittingj'the'm to fallapart.

V The jaws are-thus always maintained in op erative relation to each other.

: It'it is desired It use the clamping device,

' torholding a b olt'inste adgofza screw, asim 1 isshownclearly in: Figures 3.and; 4 and 'comple expedient is applicable to the structure,

just described: to prevent the turning. of the screwdriver within the clamping jaws; This prises a clip "16, comprising .two fiat strips 17 secured together at their ends asat '18, and;

spread apart between their ends as at 19 to provide an opening to receive the ends 3 of the screw driver. Thelength of the clip 16 is such that its ends will project beyond the adjacent edges of the clamping jaws through the cut out portions 7.

Obviously therefore, whena bolt. 20; is positioned within the clamping device as shown in Figure 3, with the head 21 thereof resting againstthe end of the screw driver 3, and against the upper edgeotthe clip 16, and the resilient clampingmember 15 is moved upwardly to clamping position, it. will be clear that the bolt 20. is securely clamped between the aws 5 by the clamping portions 6 thereof and that rotation of the screw driver with relation to the boltEZO is, prevented by means of theiclip 16 projecting out through the cut out portions 7, whereby the bolt 20 may. be read i y ur ecb y he. Screw d i er.- he l a e of the bolt 20 is effected in the same manner 7 as the release of. the screw 4, namely, by 'slidingthe, resilient clamping member, 15 downwardly. over the sloping/sides 9 of the aw,

whereuponthe coil's'pring 13tends to spread ch .j at heir pper end nd pe m h removal of the bolt 20 either through the sides 7 or through the ends thereof,

: Obviously, hange m yib made i etails. of construction and arrangement of parts without departing from the spirit and scope ofithe inv ntion. Ido. notlimit myself, therefore, to the exactstructure herein shown and s iibfid; ther hanby theappended; claims.

.I 1aimi+, I r 1 '1. Anattachmentfor screw. drivers com} prising a pair. of. complementary and interchangeable fclamping jaws adapted t o encircle h screw.- driver Provided T the crimp intermediate their ends forming pivot means thereion-and, resilient-means encircling said am i Jews and, ad ptedi be m v o.

force, said j aws towarol each other atone end.

2. An. attachm nt. f r; crew; e sc o prising a pair of complementary and inter changeable, clamping jaws, adapted-to encir: cle the screw driver. andprovided with a crimp. intermediate their ends formingpivot means therefor, and res l ent meansencirclg ditws d ten iusto... orce. th mt ward each other atone end andmeans on said aws preventing relative longitudinal move-' mentbetween said'jaws. r

.3. An attachment for screw drivers, com-J prising a pair of: clamping. jaws crimped intermediate, their; endstQ 017 1}, pivot, the heelsof said jaws being flared; outwardlyand p id fl fl e a c il sp ngenr r lin'g.

said heels and engaging, said flanges, a, 1'esi li ent clamping. device encircling and ;slidable on. saidjaws, forforcingthe opposite. ends thereof-to clampingposition, said fianges and spring retaining. said; clamping device on said aws. X Y

1. attachmentior screw drivelslcome idevice 'o-n said ja,ws',, said clamping device i comprising a coil'of flat/spring material. I

.fl5. ;An attachment-for Screw drivers come. "prising a, pair of clampingj'gzws' encircling.

' said Screw drivers ailfl provided withelampingmeans for forcing v said jaw'stowa'rdeaeh V e other at one end to-engage and hold a" screw -01" bolt, said jaws being cut awaylafltheir sidesadj ac ent such end, and a clip. engageable' o n-the enddof said screwdriver and extending lzite 'ellythfn said out a way'portibnsvwhere- .b saidscrewdriver is prevented from turn- V i ing relativetoj saidjaws'.

In testimony whereof, I afiix my signaltune.

1 d CHARLES WJB ON 

